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    <title>Document</title>
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<img src="../p1378956633.91.jpg" alt="" class="ad">
<button>停止定时器</button>

<body>
    <script>
        var ad = document.querySelector('.ad');
        var but = document.querySelector("button")
        var timer1 = setTimeout(function () {
            ad.style.display = "none";
        }, 5000);

        but.addEventListener("click",function() {
            clearTimeout(timer1)
        })
    </script>
</body>

</html>